The DFS number calculation for postdominators was broken. In the case of
multiple exits that form the post dominator root nodes, do not iterate over
all exits, but start from the virtual root node. Otherwise bbs, that are not
post dominated by any exit but by the virtual root node, will never be assigned
a DFS number.
llvm-svn: 92967
(OP (trunc x), (trunc y)) -> (trunc (OP x, y))
Unfortunately this simple change causes dag combine to infinite looping. The problem is the shrink demanded ops optimization tend to canonicalize expressions in the opposite manner. That is badness. This patch disable those optimizations in dag combine but instead it is done as a late pass in sdisel.
This also exposes some deficiencies in dag combine and x86 setcc / brcond lowering. Teach them to look pass ISD::TRUNCATE in various places.
llvm-svn: 92849
memcpy, memset and other intrinsics that only access their arguments
to be readnone if the intrinsic's arguments all point to local memory.
This improves the testcase in the README to readonly, but it could in
theory be made readnone, however this would involve more sophisticated
analysis that looks through the memcpy.
llvm-svn: 92829
An instruction like this:
%reg1097:1<def> = VMOVSR %R3<kill>, 14, %reg0
Must be replaced with this when substituting physical registers:
%S0<def> = VMOVSR %R3<kill>, 14, %reg0, %D0<imp-def>
llvm-svn: 92812
a single pointer (PointerIntPair) member. In "small" mode, the
pointer field is reinterpreted as a set of bits. In "large" mode,
the pointer points to a heap-allocated object.
Also, give BitVector empty and swap functions.
And, add some simple unittests for BitVector and SmallBitVector.
llvm-svn: 92730
clear what information these functions are actually using.
This is also a micro-optimization, as passing a SDNode * around is
simpler than passing a { SDNode *, int } by value or reference.
llvm-svn: 92564
after the MDNode in memory. This eliminates the operands
pointer and saves a new[] per node.
Note that the code in DIDerivedType::replaceAllUsesWith is wrong
and quite scary. A MDNode should not be RAUW'd with something
else: this changes all uses of the mdnode, which may not be debug
info related! Debug info should use something non-mdnode for
declarations.
llvm-svn: 92321
so can be a huge performance issue when tearing down modules and mdnodes
are not guaranteed to be unique anyway. This speeds up:
$ time ~/llvm/Release/bin/clang gcc.c -w -S -g
from 72 to 35s, where gcc.c is from:
http://people.csail.mit.edu/smcc/projects/single-file-programs/
llvm-svn: 92315
getMDKindID/getMDKindNames methods to LLVMContext (and add
convenience methods to Module), eliminating MetadataContext.
Move the state that it maintains out to LLVMContext.
llvm-svn: 92259
why one was replaced with the other. Even in the specific case of
debug information, it doesn't make sense to transfer the location over,
this will just result in jumbled loc info.
llvm-svn: 92241
a convention (shadowing the setter with private forwarding function) to
prevent subclasses from accidentally using it.
This exposed some bogosity in ConstantExprs, which was propaging the
opcode of the constant expr into the NUW/NSW/Exact field in the
getWithOperands/getWithOperandReplaced methods.
llvm-svn: 92239
